经过2天的挣扎和沮丧,我终于解决了类似的问题。诀窍是PhantomJS 官方网站中的waitfor.js示例。要开心!
"use strict";
function waitFor(testFx, onReady, timeOutMillis) {
var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 3000, //< Default Max Timout is 3s
start = new Date().getTime(),
condition = false,
interval = setInterval(function() {
if ( (new Date().getTime() - start < maxtimeOutMillis) && !condition ) {
// If not time-out yet and condition not yet fulfilled
condition = (typeof(testFx) === "string" ? eval(testFx) : testFx()); //< defensive code
} else {
if(!condition) {
// If condition still not fulfilled (timeout but condition is 'false')
console.log("'waitFor()' timeout");
phantom.exit(1);
} else {
// Condition fulfilled (timeout and/or condition is 'true')
console.log("'waitFor()' finished in " + (new Date().getTime() - start) + "ms.");
typeof(onReady) === "string" ? eval(onReady) : onReady(); //< Do what it's supposed to do once the condition is fulfilled
clearInterval(interval); //< Stop this interval
}
}
}, 250); //< repeat check every 250ms
};
var page = require('webpage').create();
// Open Twitter on 'sencha' profile and, onPageLoad, do...
page.open("http://twitter.com/#!/sencha", function (status) {
// Check for page load success
if (status !== "success") {
console.log("Unable to access network");
} else {
// Wait for 'signin-dropdown' to be visible
waitFor(function() {
// Check in the page if a specific element is now visible
return page.evaluate(function() {
return $("#signin-dropdown").is(":visible");
});
}, function() {
console.log("The sign-in dialog should be visible now.");
phantom.exit();
});
}
});